sequential_sixtrak.lay: Made knobs and wheels interactive.

[m1macrophage]

To review the changes in the Slider script, see linn_linndrum.lay.

Updates to reference Slider script in linn_linndrum.lay:

• Added support for horizontal control of knobs.
• Added support for auto-center anolog controls. Useful for the pitch wheel.
• Shortened function names.

sequential_sixtrak.lay:

• Copied reference Slider script from linn_linndrum.lay.
• Adapted layout to make knobs and wheels interactive.

[felipesanches]

Hey, @m1macrophage! That's so cool!

I was also looking for a solution for auto re-centering synth pitch wheels a couple months ago when I was working on the ESQ1 layout: #14049 (comment)

Nobody replied to my question at that time, but now I see that you found a solution to the same issue here, so I'll probably implement that on my synth layouts as well.

It is cool how the wheel smoothly re-centers gradually when we release the keys (right or left) after changing its position. But when interacting with the mouse cursor, the re-centering is abrupt and instantaneous. Have you considered how to achieve that same smooth "spring-like" transition also when using the mouse?

[galibert]

Note that on both my hardware synths the physical pitch wheel returns to center very fast when you release it.

[m1macrophage]

Have you considered how to achieve that same smooth "spring-like" transition also when using the mouse?

I think this would either require simulating the return-to-center logic in the lua script, or (preferably) triggering the key release logic of the port from the lua script. I expect both are doable, but none of them seems trivial (unless I missed a relevant port/field lua function). So I haven't looked more closely for now.

To @galibert's point, the centering is pretty quick in practice anyway. Though the spring-like animation does look cooler :). And it is possible a quick, but not instant, centering will sound better.